Voyager Mission Operations Status Report #1198 – 13-19 October 2001

COMMAND TRANSMISSION & VERIFICATION OPERATIONS

Voyager 1 command operations consisted of the uplink of a command loss timer reset on 10/18 [DOY 291/0310z]. The command was not transmitted due to an antenna halt caused by an Az encoder problem at DSS-14 [DR G100432].

Voyager 2 command operations consisted of the uplink of seven bracketed command loss timer resets sent on five-minute centers using 0.5 Hz steps on 10/16 [DOY 289/1352z]. The spacecraft received four of the seven commands sent.

SEQUENCE GENERATION OPERATIONS

Started development of a mini-sequence for Voyager 2.

DATA RETURN OPERATIONS

Voyager 1 Data Processing and Operations:

There were 62.7 hours of DSN scheduled support for Voyager 1 of which 37.6 hours were large aperture coverage. There were no real-time or schedule support changes during the period.

There were two significant outages.ÊÊ The first outage of 0.6 hours duration on 10/18 [DOY 291] resulted from an antenna halt caused by Az encoder problems at DSS-14 [DR G100432]. The second outage of 2.2 hours duration on 10/19 [DOY 292] resulted from signal attenuation caused by rain at DSS-65 [DR L100211].Ê

Science instrument performance was nominal for all activities during this period. One frame of GS-4 data was recorded this week. Fifteen frames of data were played back on October 16, 97% of this data were recovered. Fourteen frames of data were played back on October 17, 94% of this data were recovered. The EDR backlog is 2 days.Voyager 2 Data Processing and Operations:

There were 63.5 hours of DSN scheduled support for Voyager 2 of which 38.1 hours were large aperture coverage. There were no real-time or schedule support changes made or significant outages during the period

Science instrument performance was nominal for all activities during this period. One frame of GS-4 data was recorded this week. A second frame of GS-4 data was recorded on October 13, using the BHELI 1 cyclic, which was enabled on July 14. The EDR backlog is 2 days.

FLIGHT SYSTEM PERFORMANCE

Voyager 1 performance was nominal during this report period. Activities included switching X-Band to Hi Power on 10/15 (DOY 288), DTR PWS playback on 10/16 and 10/17 (DOY 289 and 291), and X-Band to Low power on 10/18 (DOY 289).

Voyager 2 performance was nominal during this report period. Activities included a PMPCAL on 10/16 (DOY 289) and the turning ON of Gyros A & B on 10/18 (DOY 291)